Artist, fanfic writer who has two pen-names.
Main pen-name: HappySwan (γγγγΌγ»γΉγ―γ³)
Niconico / pixiv name: η½ι³₯ γ―γ«γ‘ (Hakuchou Wakame)
Circle name: η½ι³₯εΊ§ (Hakuchou-za)
Site name: γγι¨ε± (Momo-beya)
(This artist also has a real-name facebook account. It's not related to danbooru though.)